Assessment of the Phase Equilibria and Solution Thermodynamics of Antimony-Bismuth Alloys

摘要

A critical assessment on the thermodynamic mixing properties of antimony-bismuth alloys under atmospheric pressure has been carried out by using a least squares method. Thermodynamic primary measurements together with phase diagram data were used for optimizing the model parameters for Legendre polynomials of the solid and liquid alloys by the Lukas program. The excess Gibbs energies of mixing of the rhombohedral solid solution and the molten antimony-bismuth alloy were fitted with zeroth order Legendre polynomials identical with Redlich-Kister and Margules polynomials as follows: G(rho) = X(Bi).X(Sb) (2389.66 - 0.52126T) J/Mol and G(rho) = X(Bi).X(Sb) (-1188.28 + 15.19501T + 0.30T(1-1nT)) J/mol. The liquidus line was found to be well documented in the experimental studies and it was in good agreement with the earlier assessments as well as with the optimized thermodynamic data of the study. Significant systematic errors exist in the experimental solidus data.